The weaned piglets were used as a model to observe the pathology of the piglets challenged with a Haemophilus parasuis isolate.

• 摘要用副猪嗜血杆菌分离株感染断奶仔猪，发病仔猪临床表现为体温中度升高、精神不振、被毛粗乱、站立不稳、厌食、呼吸困难。